查看“Python math函数”的源代码

==官方文档==
https://docs.python.org/zh-cn/3/library/math.html

==常用用法==
引入库：

 import math
===求开方===
>>> math.sqrt(4)
2.0

>>> 4**0.5

2.0

===取整===
>>> math.ceil(3.5)

4

>>> math.floor(3.5)

3

>>> math.floor(3.5)
3

===最大公约数===
>>> math.gcd(12,16)

4

>>> math.lcm(12,16)

 Traceback (most recent call last):
  File "<pyshell#9>", line 1, in <module>
    math.lcm(12,16)
AttributeError: module 'math' has no attribute 'lcm'

===log函数===
>>> math.log(2)

 0.6931471805599453

>>> math.log(2,10)

 0.30102999566398114

>>> math.log(10,100)

0.5

>>> math.log(100,10)

2.0

>>> math.log2(4)
 
 2.0

===三角函数===
>>> a=math.pi/2

>>> math.sin(a)

1.0

>>> math.cos(a)

6.123233995736766e-17

>>> math.tan(a)

1.633123935319537e+16



===求阶乘===
>>> math.factorial(4)

24